<template>
    <div>
        <div class="section">
            <div class="location">
                <span>当前位置：</span>
                <a href="/index.html">首页</a> &gt;
                <a href="/cart.html">购物车</a>
            </div>
        </div>

        <div class="section">
            <div class="wrapper">
                <div class="bg-wrap">
                    <!--购物车头部-->
                    <div class="cart-head clearfix">
                        <h2>
                            <i class="iconfont icon-cart"></i>我的购物车</h2>
                        <div class="cart-setp">
                            <ul>
                                <li class="first active">
                                    <div class="progress">
                                        <span>1</span>
                                        放进购物车
                                    </div>
                                </li>
                                <li>
                                    <div class="progress">
                                        <span>2</span>
                                        填写订单信息
                                    </div>
                                </li>
                                <li class="last">
                                    <div class="progress">
                                        <span>3</span>
                                        支付/确认订单
                                    </div>
                                </li>
                            </ul>
                        </div>
                    </div>
                    <!--购物车头部-->
                    <!--商品列表-->
                    <div class="cart-box">
                        <input id="jsondata" name="jsondata" type="hidden">
                        <table width="100%" align="center" class="cart-table" border="0" cellspacing="0" cellpadding="8">
                            <tbody>
                                <tr>
                                    <th width="48" align="center">
                                        <a>全选</a>
                                    </th>
                                    <th align="left" colspan="2">商品信息</th>
                                    <th width="84" align="left">单价</th>
                                    <th width="104" align="center">数量</th>
                                    <th width="104" align="left">金额(元)</th>
                                    <th width="54" align="center">操作</th>
                                </tr>
                                <tr v-show="goodsList.length<=0">
                                    <td colspan="10">
                                        <div class="msg-tips">
                                            <div class="icon warning">
                                                <i class="iconfont icon-tip"></i>
                                            </div>
                                            <div class="info">
                                                <strong>购物车没有商品！</strong>
                                                <p>您的购物车为空，
                                                    <a href="/index.html">马上去购物</a>吧！</p>
                                            </div>
                                        </div>
                                    </td>
                                </tr>
                                <tr v-for="(item,index) in goodsList" :key="item.id">
                                    <td width="48" align="center">
                                        <el-switch v-model="item.isSelected" :width="45" active-color="#0094ff" inactive-color="#555555">
                                        </el-switch>
                                    </td>
                                    <td align="left" colspan="2">
                                        <img width="50" height="50" :src="item.img_url" alt=""> {{item.title}}
                                    </td>
                                    <td width="84" align="left">{{item.sell_price}}</td>
                                    <td width="120" align="center">
                                        <inputnumber @goodsCountChange="getChangedGoodsCount" :goods="item"></inputnumber>
                                    </td>
                                    <td width="104" align="left">{{item.sell_price * item.buycount}}</td>
                                    <td width="54" align="center">
                                        <a href="javascript:void(0)" @click="deleteGoods(index)">删除</a>
                                    </td>
                                </tr>
                                <tr>
                                    <th align="right" colspan="8">
                                        已选择商品
                                        <b class="red" id="totalQuantity">{{getTotalCount}}</b> 件 &nbsp;&nbsp;&nbsp; 商品总金额（不含运费）：
                                        <span class="red">￥</span>
                                        <b class="red" id="totalAmount">{{getTotalAmount}}</b>元
                                    </th>
                                </tr>
                            </tbody>
                        </table>
                    </div>
                    <!--/商品列表-->
                    <!--购物车底部-->
                    <div class="cart-foot clearfix">
                        <div class="right-box">
                            <button class="button" onclick="javascript:location.href='/index.html';">继续购物</button>
                            <button class="submit" @click="goToOrder()">立即结算</button>
                        </div>
                    </div>
                    <!--购物车底部-->
                </div>
            </div>
        </div>
    </div>
</template>

<script>
    //从 localStorageHelper.js 中导入getGoods
    import { getGoods } from '../../common/localStorageHelper'

    //导入子组件
    import inputnumber from '../subcomponents/inputnumber'

    export default {
        data() {
            return {
                goodsList: []
            }
        },
        computed:{
            //获取总件数
            getTotalCount(){
                let totalCount = 0
                this.goodsList.forEach(item=>{
                    if(item.isSelected){
                        totalCount+=item.buycount
                    }
                })

                return totalCount
            },
            //获取总价格
            getTotalAmount(){
                let totalAmount= 0
                this.goodsList.forEach(item=>{
                    if(item.isSelected){
                        totalAmount+=item.buycount * item.sell_price
                    }
                })

                return totalAmount
            }
        },
        created() {
            this.getGoodsListData()
        },
        methods: {
            //加载购物车中的商品数据
            getGoodsListData() {
                const goodsObj = getGoods()

                const idsArray = []
                for (const key in goodsObj) {
                    idsArray.push(key)
                }
                
                if(idsArray.length <= 0){
                    return
                }

                //发送请求的url
                const url = `site/comment/getshopcargoods/${idsArray.join(',')}`

                this.$axios.get(url).then(response => {
                    response.data.message.forEach(item => {
                        item.buycount = goodsObj[item.id]
                        item.isSelected = true
                    });
                    this.goodsList = response.data.message
                })
            },
            //获取子组件中的商品发生改变之后的值
            getChangedGoodsCount(changedGoods){
                //1.更新购物车上面的数字 & 2.更新localStorage中的值
                this.$store.commit('changeGoodsNumber',changedGoods)

                //2.更新购物车中更改对应的商品的buyCount的值
                const index = this.goodsList.findIndex(item=>item.id === changedGoods.goodsId)
                
                this.goodsList[index].buycount = changedGoods.count
            },
            //删除商品
            deleteGoods(index){
                //1、删除localStorage中的值
                this.$store.commit('deleteGoodsById',this.goodsList[index].id)

                //2.删除自身的值
                this.goodsList.splice(index,1)
            },
            //去结算
            goToOrder(){
                const tempArray = []
                this.goodsList.forEach(item=>{
                    if(item.isSelected){
                        tempArray.push(item.id)
                    }
                })

                this.$router.push({name:"order",params:{goodsIds:tempArray.join(',')}})
            }
        },
        components:{
            inputnumber
        }
    }
</script>